Grasshopper

algorithmic modeling for Rhino

La deferlante (the breaker)

Hello people,

I am helping an artist in the realization of very special wooden fence.

Its my first try with grasshopper.
I found a very stupid way to do it.
I think that a clever use of lists and data trees would allow me to avoid the spaghetti effect...

Does somebody could give me clue?

The principle

(I guess it is all about recursivity.)

We have a curve C
we divide this curve and we get n points PC0, PC1, PC2, ...PCn
We have one vertical line L0 starting from PC0
we have n spheres centered curve points Sp0, Sp1, ...SPn

STep1
I0 is the intersection between Sp0 and L0,
L1 is the line between PC1 and I0
we offset that line L1 following a plane defined by I0, PC1 and PC0.
We get OL1.
I1 is the intersection of OL1 and SP1.


STep2
L2 is the line between PC2 and I1
we offset that line L2 following a plane defined by I1, PC2 and PC1.
We get OL2.
I2 is the intersection between Sp2 and OL2,

...

STepn
Ln is the line between PCn and In-1
we offset that line Ln following a plane defined by In-1, PCn and PCn-1.
We get OLn
In is the intersection between Spn and OLn

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Replies to This Discussion

Permalink Reply by BALDA on October 9, 2012 at 8:30am

How to create cascading actions?

Permalink Reply by Yoann Mescam (Systemiq) on October 9, 2012 at 9:33pm

Hoopsnake

A bit more work do all the fence starting from all the curves on ground.

Permalink Reply by BALDA on October 10, 2012 at 2:26am

Thank you very much systemiq, so clever!

I read about Hoopsnake a few days ago...

I'll try to reproduce your GH layout as soon as possible!

Permalink Reply by BALDA on October 10, 2012 at 6:50am

Hello Systemiq, I tried to recreate your layout exactly like a good boy but there is something wrong.

What is the expression in the orange list item component?

Permalink Reply by BALDA on October 10, 2012 at 7:13am

In reality... I know nothing about expression...

Permalink Reply by Yoann Mescam (Systemiq) on October 10, 2012 at 9:34am

i+1 (and L-1 in the Length component).

Permalink Reply by BALDA on October 10, 2012 at 11:11am

Thank you very much

I start to understand the logic of your layout...

it seems to work now, now I need to learn Hoopsnake!

I need to figure out how we make the created lines stay!

Permalink Reply by BALDA on October 10, 2012 at 11:19am

Ok I get it
It seems that you have a former version of hoopsnake

mine (latest from today) has a new parameter called
"H (feedback history)"...


I'll study that very soon...

Permalink Reply by Yoann Mescam (Systemiq) on October 10, 2012 at 11:44am

Désolé j'ai oublié de préciser que dans Hoopsnake (clic droit sur le composant), New Data devait être mis à "is prepended".

Permalink Reply by BALDA on October 10, 2012 at 2:20pm

Et en plus tu parles français!!!!!

tu as reconnu mon frenglish?

Ok j'ai remplacé Hoopsnake 0.6.4 par 0.6.3

j'ai maintenant accès à l'option "is prepended"

et tout marche impeccablement!!!

Mille mercis à Mr Systemiq!!

I'll post the final definition soon...

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